SOUTH PORTLAND — The EPA has fined a South Portland company that manufactures and stores hazardous materials $151,900 for for failing to store dangerous chemicals properly.

The Environmental Protection Agency said in a news release that Monson Companies Inc. of Leominster, Mass., operates a warehouse, distribution, repackaging and custom blending chemical manufacturing facility in South Portland. The company was issued a complaint by the EPA for allegedly failing to comply with the Clean Air Act, the Maine Hazardous Waste Management rules and federal Emergency Planning & Community Right-to-Know Act.

Monson allegedly stored chemicals that alone or in combination can cause explosions, toxic gas plumes or fire, and stored them close enough to other chemicals that a spill or release could lead to a chemical reaction with nearby materials.

“Failure of a facility to identify hazards and design and maintain a safe facility in order to limit accidental releases of extremely hazardous substances puts the local population and environment at risk,” the EPA said in its release.

The facility, located at 1 Runway Road, also failed to identify wastes so they could be safely managed, maintain an emergency plan and submit an inventory of materials to emergency responders.

The EPA has brought 10 Clean Air Act enforcement actions against companies storing chemicals after a series of inspections.

Monson has since addressed the hazards, the EPA said.